MEDICAL PHYSIOLOGY

Detailed explanation-1: -Shrinking the diameter of blood vessels that supply the skin, a process known as vasoconstriction, reduces blood flow and helps retain heat.

Detailed explanation-2: -The circulatory system helps in heat conservation by vasoconstriction and vasodilation of blood vessels. Thermoregulation is the regulation of heat transfer from the body. When the body is hot, sweat is released from the skin, and when it is cold, less sweat is released from the skin so less heat energy is lost.

Detailed explanation-3: -Blood vessels supplying blood to the skin can swell or dilate-vasodilation. This causes more heat to be carried by the blood to the skin, where it can be lost to the air. Blood vessels can shrink down again-vasoconstriction. This reduces heat loss through the skin once the body’s temperature has returned to normal.

Detailed explanation-4: -Normally, the vessels that supply blood to the skin constrict or narrow in response to cold temperatures. This reaction, called “vasoconstriction, ‘’ decreases blood flow to the skin, which helps to minimize heat loss from the warm blood and therefore preserve a normal internal or “core” temperature.